function popup_image(popup_href, img_width, img_height)
{

  var paddingTop=0;
  var paddingBottom=0;
  var paddingLeft=0;
  var paddingRight=0;
  if (typeof screen.availWidth != 'undefined' && typeof screen.availHeight != 'undefined')
  {
    if (typeof screen.availLeft != 'undefined' && typeof screen.availHeight != 'undefined')
    {
      var left = Math.max(0, Math.ceil(screen.availLeft + (screen.availWidth - img_width - paddingLeft - paddingRight) / 2));
      var top = Math.max(0, Math.ceil(screen.availTop + (screen.availHeight - img_height - paddingTop - paddingBottom) / 2));
    }
    else
    {
      var left = Math.max(0, Math.ceil((screen.availWidth - img_width - paddingLeft - paddingRight) / 2));
      var top = Math.max(0, Math.ceil((screen.availHeight - img_height - paddingTop - paddingBottom) / 2));
    }
  }
  else
  {
    var left = 0;
    var top = 0;
  }

  var preview = window.open(popup_href, 'preview', 'width='+img_width+',height='+img_height+',top='+top+',left='+left+',resizable=0,toolbar=0,directories=0,location=0,menubar=0,personalbar=0,scrollbars=0,status=0');
  preview.focus(); 
  return false;
}


function MM_findObj(n, d) { //v4.01
    var p,i,x;
    if(!d)
        d=document;
    if((p=n.indexOf("?"))>0&&parent.frames.length) {
        d=parent.frames[n.substring(p+1)].document;
        n=n.substring(0,p);
    }
    if(!(x=d[n])&&d.all)
        x=d.all[n];
    for (i=0;!x&&i<d.forms.length;i++)
        x=d.forms[i][n];
    for(i=0;!x&&d.layers&&i<d.layers.length;i++)
        x=MM_findObj(n,d.layers[i].document);
    if(!x && d.getElementById)
        x=d.getElementById(n);
    return x;
}

function MM_swapImage() { //v3.0
    var i,j=0,x,a=MM_swapImage.arguments;
    document.MM_sr=new Array;
    for(i=0;i<(a.length-2);i+=3)
        if ((x=MM_findObj(a[i]))!=null) {
            document.MM_sr[j++]=x;
            if(!x.oSrc)
                x.oSrc=x.src;
            x.src=a[i+2];
        }
}

function MM_swapImgRestore() { //v3.0
    var i,x,a=document.MM_sr;
    for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++)
        x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
    var d=document;
    if(d.images) {
        if(!d.MM_p)
            d.MM_p=new Array();
        var i,j=d.MM_p.length,a=MM_preloadImages.arguments;
        for(i=0; i<a.length; i++)
            if (a[i].indexOf("#")!=0) {
                d.MM_p[j]=new Image;
                d.MM_p[j++].src=a[i];
            }
    }
}